Hi zwing,
You don’t run into this issue while using the 1.18.1-1 Demo, correct?
So the question is: what is wrong with your environment or installation?
Troubleshooting on a mobile device is quite limited.
So visit the installation using a desktop browser (I recommend Chrome for this).
Press Control+Shift+J to open the Console (Command+Option+J on a Mac).
Resize the left panel (containing your installation) until the navigation icons disappear).
What errors (if any) appear in the Console?
Also check your apache logs for relevant errors.
Let me know what you find.